Figures index

From

Review on 4-Hydroxycoumarin Chemistry: Synthesis, Acylation and Photochemical Properties

Jules Yoda, Abdoulaye Djandé, Lamine Cissé, Akoun Abou, Léopold Kaboré, Adama Saba

World Journal of Organic Chemistry. 2019, 7(1), 19-30 doi:10.12691/wjoc-7-1-4
  • Figure 1. Numbered structure of 4-hydroxycoumarin
  • Figure 2. Tautomeric forms of 4-hydroxycoumarin
  • Figure 3. 4-hydroxycoumarin synthesis routes
  • Figure 4. Compound 1: Synthesis by Pechman reaction
  • Figure 5. Compound 1: Synthesis using Meldrum’s acid
  • Figure 6. Compound 1: synthesis using 2’-hydroxyacetophenone
  • Figure 7. Compound 1: formation by condensation of 1-(2-hydroxyphenyl)ethanone
  • Figure 8. Compound 1 : formation using 4-acyl-3-hydroxycoumarin and 4-coumarinyl carboxylate
  • Figure 9. Compound 1: formation by cleavage reaction
  • Figure 10. Compound 1: formation by deacylation reaction
  • Figure 11. Compound 1 formation by decarboxylation reaction
  • Figure 12. Compound 1: formation by photooxygenation of chromone-2-carboxylic Acid
  • Figure 13. Mesomeric equilibrium between alcoholate anion and carbanion from 4-hydroxycoumarin
  • Figure 14. 3-acyl-4-hydroxycoumarin synthesis under ultrasound
  • Figure 15. Formation of 3-acyl-4-hydroxycoumarin with R= Alkyl or aryl
  • Figure 16. Formation of 3-formyl-4-hydroxycoumarin
  • Figure 17. Formation of 3-acetyl-4-hydroxycoumarin
  • Figure 18. Formation of 3-acetyl-4-hydroxycoumarin via acetate of 4-coumarinyl
  • Figure 19. Formation of 3-acetyl-4-hydroxycoumarin using phosphorous oxychloride
  • Figure 20. Microwave synthesis of O-acylated 4-hydroxycoumarin derivatives
  • Figure 21. Carboxylate of 4-coumarinyl synthesis using HSAB theory
  • Figure 22. Ortep structure of compound of 27b
  • Figure 23. Ortep structure of compound 27c
  • Figure 24. Ortep structure of compound of 27e
  • Figure 25. Ortep structure of compound of 27d
  • Figure 26. Structure of compound 28
  • Figure 27. Structure of compound 29
  • Figure 28. Structure of compound 30
  • Figure 29. Fluorescence emission of compound 27e in acetonitrile